The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

YosemitySam

Fixed it thanks for the help....

YosemitySam

Well I did find out after looking in to it more, that they have a different pin out than the 29 so that explanes why they don't work. I'm still not sure where I can get the part, all that I have seen are for the 29 common anoid insted of common cathoid. Any help would be great guys thanks.... :bangh...

YosemitySam

Does anyone have the part number to replace stock Channel led in A Cobra 25ltd Classic? The part that works in the Cobra 29 is not the same? Or am I doing somthing wrong???

YosemitySam

Make and Model:Cobra 29ltd Chrome PCB Number: EPC-060-M1 PLL Number:29ltd 0505 11600-00 Test gear available: AM/FM Signal Generator, Osilliscope, Bird 43, Fluke 8050a, Hickok Frequency Counter, Sinadder, Audio generator,ect.... Symptoms: Radio has slight RX, while no TX at all. Keyup will allow talk...

YosemitySam

I have used the 2312 in cobra 29, with great results. They sound "in my opionion" better than the mosfets people brag about all the time. Sad that the 1969's and 2312's are becomeing absolete. Mosfet may put out more but need to be cut back look good on the scope. Just my input..... take w...

YosemitySam

Hey, sorry no one answered you question, I get that a lot too. But I do have some info for future referance to those who want to do this mod to other radios. I don't know if you radio fall into it or not but, if not you have just added to my list and made it easier if I should have to do the mod in ...

YosemitySam

General lee radio,

Relay talkback needs to be uninstalled, any info?

Thanks Fella's

YosemitySam

No problem, I acutually emailed Cobra with the board number. I find that if you email places like Cobra or Galaxy for Schematics or other Aligment related isues they can sometimes help but not always.

YosemitySam

You may already have this,

http://downloads.cobra.com/CB/Models/20 ... ervman.pdf

http://www.cbtricks.com/radios/cobra/2000gtl/index.htm

Hope that helps

YosemitySam

Did a quick check, I found the Alignment for the radio in this pdf file on the same link as above.

http://www.cbtricks.com/radios/cobra/20 ... e_info.pdf

Hope that will help, thats all I could come up with for now....

YosemitySam

Hi, not sure this will help. I don't know much about this radio but here is a link to some helpful things. You may have already searched it out but just incase you haven't seen it yet. Hope it helps.... 73's

http://www.cbtricks.com/radios/cobra/20 ... /index.htm

YosemitySam

Just reniewed my $20 membership, its worth every penny. Nothing wrong with this site as long as we can keep out government/taxes via cap and trade, that could happen soon.

YosemitySam

Thanks timrim, I understand now. You helped me out and pointed me in the right direction. Any other suggestions would be greatly apprecianted. Thanks for all the help!

YosemitySam

Thanks timrim, I have the probe. So, do you connect it direct to PL259? Do I need a dummy load for RF output measurements or just the probe & Oscope? Thanks!!

YosemitySam

I have been reading about Generators and Oscilloscopes. But, I am not having much luck finding what type of probes to use. I know that for recieve alignment you input RF into antenna and connect Oscope to speaker with 8ohm load. But, not sure how to hook up to show modulation. I assume of corse I wi...

YosemitySam

Hey fella's. Thanks for all the info and tech help on this. After all your input and help, I final located the problem after finding a schematic I found that Ramblingman and Rick are right on the money. The power to tr41 comes from the on off switch. What was confusing is. The switch was good and I ...

YosemitySam

My Volt Ohm Meter was bad. Got new one now. tr51 Base 13.76 v.d.c. Collector 0 v.d.c. Emitter 13.32 v.d.c TR41 Base 0 v.d.c. Collector 0 v.d.c. Emitter 0 v.d.c IC8 has 0.0 volts at every pin. Can't find any voltage to TR41 and it is newly replaced. D93 checks ok. I am still learning and open to any ...

YosemitySam

Thanks, ramblingman. I checked tr41 and replaced it, it had no voltage anywhere. There is voltage and tr51 Base 8.5 v.d.c. Collector 0 v.d.c. Emitter 8.7 v.d.c witch doesn't make sence to me. I think maybe my VOM is bad. I will have to check it out tomarro and try again. I replaced tr41 anyway. But,...

YosemitySam

THanks SmokinJoe, That's It!!! That's what I needed!!

YosemitySam

I have several old style Connex Echo boards I would like to use on four pin cobra's and such. Does, anyone know how these hookup. Or mybe direct me to some instructions on how to install them. I use to know how. But, have forgoten how and can't find my install Info. These have Red, Black which I'm s...

YosemitySam

I have no power to channel readout on a Galaxy 77hml. But, there is power to chanel meter. Does not TX or RX. What are the possible causes? Thanks Fella's!!

YosemitySam

Thanks fella's for all the reply's! I have replaced all resistors that need to be, replaced. Replaced power tranformer. On this board the c-51 andc-52 are c-90 and c-91 I will check those as well. The choke I refured to is L4 this must be another version than the one Ramblingman is refuring to but, ...

YosemitySam

Well, I replaced the Power Transformer, I have also found a few over heated resistors R69, R54, R66, R158, R6, On to replacing those now. Can't power up until I find out If I switched the wires on the on/off switch. Still haven't found a schematic. Oh, I also don't know what L4 choke value is, It wa...

YosemitySam

PLL LC7120, IC KIA7217AP not sure about ref numbers yet. Has a HI, CB, and Low swith. Okay, I have checked Final and It is okay. Turns out I was looking at the Power transformer instead of audio. If I had a schematic it would have been more spottable. Sorry, I'm still new and learning. Keying diodes...

YosemitySam

Thanks for the reply guy's. After surching high and low I cannot find a schematic any place. If any one happen to have one. It would be a great help if you would post it or mail it to me. As far as the fuse it is a 2 amp and it will not blow I even change it thinking the fuse is marked wronge. Still...

YosemitySam

I had good carrier with a little modulation, Before I replaced it. I double checked the wires. All are right there. I drew a schematic before I unhooked the pot, just to be sure I rehooked right. I am getting 13.8 volts to power and out. I don't want to experiment with redirecting wires for fear of ...

YosemitySam

Well, I replaced a volume pot in this radio and now it only transmits 0.5 watts,with little if any modulation. Audio transformer is also getting hot. I'm puzzled with this, all I did was fix the volume pot. I now have volume with no transmit. I changed the final cause I had one one handy. Did not wo...

YosemitySam

Thanks redeye. I just missed it. But, I found somthing that might work.[/img]

YosemitySam

Well I tried 470K across c155/r207 to c187/r235. It worked, Thanks ramblingman! But, after keying a few times I notice that for a short period after leting down the key. It was acting like it was still keying kind of like it had roger beep without the beep. I decieded to try a 1n914a in series with ...

YosemitySam

The mic is just bone stock D104. Thanks for the info I have other power mics and they work well. But, I just like to tinker, and, learn differant things. Hands on really helps and playing with this stuff. So, if anyone has any info how to build one, that would be great. Thanks for the reply, RedEye!!!

YosemitySam

I have a D104 Lollipop mic. It only has three wires in it. I have it wired for a Galaxy dx2547 works ok. But I need more Modulation from the mic. Anyone know how to turn it into a V-power mic?

YosemitySam

I have a connex 3300 plus radio works fine has 100% modulation. RF power is about 6watts swinging 35watts with RK56 mic. Radio talks fine get good reports, Only problem is I can't use echo without squealing through the talkback. Is there a way to turn the talkback down? I doesn't have a pot for talk...

YosemitySam

This might help.
http://www.electronickits.com/kit/plans ... bradio.htm

YosemitySam

Would it be good to Have a 13.8v dc power supply with with 10 amp constant for every 100 watt of amplifer? In other word's If a had 500 watts peak I would have 50amp constant power supply. Or do I need more?

YosemitySam

Site works for me. Thanks fella's

YosemitySam

Thanks Fella's! I didn't expect a reply so soon. You helped me solve the problem yet again. Thanks for getting my pea brain in gear. I didn't isolate the 10.240 xtal from the mixer. Thanks for the links and advice. God Bless from Me to You and Yours!! Hope This Site and All a Long life...

YosemitySam

I installed an Expo 100 S- kit in my PC66xl. It transmits just fine no problems but will not change on receive side. Say I would like to transmit on 27.185 it works it also recieves on 27.185. But, when I go low side 26.745 it transmits 26.745. But, recieves on 27.185. I followed intructions conneti...

YosemitySam

Man rick your just helping me out alot today. Thanks for the info. I knew it had to be pretty simple stuff. I will try that tonight. I had it all appart looking for cold solders and bad wire ect... seems to be in ok condition if all goes well it should work. Do you know of any place that make partw ...

YosemitySam

Thanks Rick, You've been a great help. I've used ken's before didn't know they sold parts too. This is great stuff. I'm amazed at your knowledge and, that you are so willing to help. Local guys here just put there noises up and snarl. 73's Hope it's all good, in your section of the Globe. YosemtySam...

YosemitySam

I have a D104 lollipop, no other markings. I guess the tag has been removed. Opened up the bottom no mods there, looks stock and is not a power mic. Problem is I would like to wire it for my Galaxy DX2547. Anyone know how to wire one of these old Ham Jobs to a Galaxy 4pin? Any info would be great. L...

YosemitySam

Thanks Rick, That good stuff. I have access to all those parts expect I can't find crystals. Have any ideas where to buy them at?

YosemitySam

I know you can buy a kit to get uppers and lowers. But, I'm just curious if anyone would know how to build a kit that will get just the lower band. I think it can be done with a crystal and a few passives. But, I could be beating at the air too. I'm sure someone knows all the theroy and technical ga...

YosemitySam

I'm what they call a copy cat screwdriver hillbilly. So, don't just take my advise. I found that placing a 31pf to 110pf ceramic cap accross C62 improves the mod well for me. I had the same problem you had. And this increased deadkey from 1w to 5w and swing from 17w to 32watts. But there could be a ...

YosemitySam

Thanks Scott!!! Thats good stuff. Good luck!!!!

YosemitySam

Anyone know good books ect... Where to get more knowledge? Starting from the basics up to the ham tech. And, such things as antenna building? And anything in between concerning CB or ham. I just have basic knowledge. My Grandfather taught electronics in the Navy wish I would have paid attention more...

YosemitySam

Can someone please explain the "modification" of converting you stock Ranger (Galaxy, Mirage, etc.) roger beep to a roger fart. How STUPID is that, it's bad enough that people don't know when and where to use a Roger-Beep, and then someone wants to make it more annoying. Give us all a bre...

YosemitySam

Does the Cobra 150 have an internal adjustment for Echo? My symptoms are, As soon as I dead key the echo starts. It picks up the plastic click of my mic and gets faster and louder. Adjusting echo with knob does not help. Turning Talkback down doesn't help. I have installed 1uF electrolytic capacitor...

The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

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